How to explode Pie Chart ?

Hey everyone, 
I have another little question, but I can't find a way to set it up. 
I would like to explode a slice of a Pie Chart when the value of the slice is the greatest value. (see the attachments) 
 
I can't do this via the expression builder : I can get the current value (valueData) but I don't know how to build the expression, I would like something like "if (valueData == 'maxValue')". 
I try to set and use a global variable, but it seems to not be interpreted. 
 
I think I have to use the Scripting, I find a function on PieChartSerieImpl : setExplosionExpression(). 
But I don't know how I can express "when the current value equals the max value". 
And I also don't really know when set up the script (on beforeDrawSeries ?, ...) 
 
Thanks you, 
Best regards, 
 
PommePote

Find more posts tagged with

Comments

mwilliams

Take a look at this example. The script in the chart script sets a variable that is recalled in the chart editor expression for the explode slice when. It was made in BIRT 3.7.0.

PommePote

<blockquote class='ipsBlockquote' data-author="'mwilliams'" data-cid="82225" data-time="1314900343" data-date="01 September 2011 - 11:05 AM">
Take a look at this example. The script in the chart script sets a variable that is recalled in the chart editor expression for the explode slice when. It was made in BIRT 3.7.0. </blockquote>
 
Hi mwilliams, 
And thanks you very much, that works perfectly. 
When I tried, I tried to use the reportContext in the chart expression editor, but I think that we can't use it in it. 
 
Thanks you, 
PommePote.

mwilliams

Glad to help. Let us know whenever you have questions!

Deb P

Hi Michael, Where is the explample? I don't seem to find it. Thanks,Deb

kclark

Hi Deb, I'm not sure if <a data-ipb='nomediaparse' href='http://www.birt-exchange.org/devshare/_/designing-birt-reports/1418-explode-largest-pie-slice-in-pie-chart'>this is the example</a> in mwilliams post but it should show what you're looking for